Non-Ethical Efficacy

Does Nussbaum's value of narrative form apply to philosophical concepts outside of ethics?

My first pre-critical answer to this question was yes; I believed that certain non-ethical concepts might indeed be better suited to narrative depiction. However, after reading the comment that Corey wrote on one of Jacob's blog posts (Nussbaum's Novel Notion), I decided that I was approaching this question from the wrong perspective. I agree with Corey's analysis (essentially) that different writers with different concepts will be more or less effective using different forms. It seems to be a matter of skill and preference that determines the effectiveness of communicating an idea. Furthermore, any notion of an objective manner by which we can determine the efficacy of a particular writing form for a particular concept needs much more defense than Nussbaum has provided thus far.